your unit is over heating .... that's simply because your fan on the heat sync is not working .....clean the fan and test but if the fan continues not working thenhalt usage of the system until the fan is fixed

It appears you have already tried to install Windows 8 and cancelled the installation in the middle. As per the symptoms mentioned by you, its recommended to restore the system to original factory settings. You may also try to update the system BIOS after the restoration is complete.

You may refer to the link below for the list of drivers available for Studio 1558:

your unit is over heating .... that's simply because your fan on the heat sync is not working .....clean the fan and test but if the fan continues not working thenhalt usage of the system until the fan is fixed